Just an interesting note on milage. These are not exact numbers but pretty dang close. I worked them to actually LOWER the mileage, I was originally coming out HIGHER MPG.
I did about 240ish miles yesterday (did it saturday too, so i have a baseline) drained about half a tank of gas (I'm using 14gals for calc, filled up only 13ish) doing 80+

That average speed doesn't include the times I just "HAD" to open it up, I was driving no where near conservative

This is a 2004 FX4 SCAB with 4.11 gears, 295/70R17 tires, dual exhaust, AF1 Intake and Mike T. tuned Xcal. I was running the 93 Max performance with sunoco 94 Ultra octane gas both down and back.


So I averaged over 17MPG highway

 

Keep it under 120mph on the highway and you’ll get decent mpg’s